White Spots back again on 08 MBP. Argh

I love my MBP but the white burnout spots are now back. I had apple replace the logic board and parts last year after giving them hell customer service wise and went through the processes to get it done via the executive customer service lines. Props to them and it was working perfectly when I got it back.

Now noticing the white spots are back and more noticeable on the MBP. Want a new one but $2500 is spendy right now. Any tech experts or macbook pro repair experts know what causes this or if it's a workable repair?

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